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BS EN 253:2009+A2:2015 District heating pipes. Preinsulated bonded pipe systems for directly buried hot water networks. Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene, 2015
- Contents Page
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Requirements [Go to Page]
- 4.1 General
- 4.2 Steel service pipe [Go to Page]
- 4.2.1 Specification
- 4.2.2 Diameter
- 4.2.3 Wall thickness
- 4.2.4 Surface condition
- 4.3 Casing [Go to Page]
- 4.3.1 Material properties [Go to Page]
- 4.3.1.1 Material composition
- 4.3.1.2 Melt mass-flow rate
- 4.3.1.3 Thermal stability
- 4.3.1.4 Use of rework material
- 4.3.2 Casing properties [Go to Page]
- 4.3.2.1 Nominal outside diameter
- 4.3.2.2 Wall thickness
- 4.3.2.3 Appearance, surface finish, pipe ends
- 4.3.2.4 Elongation at break
- 4.3.2.5 Heat reversion
- 4.3.2.6 Stress crack resistance
- 4.4 Polyurethane rigid foam insulation (PUR) [Go to Page]
- 4.4.1 Composition
- 4.4.2 Cell structure
- 4.4.3 Compressive strength
- 4.4.4 Foam density
- 4.4.5 Water absorption at elevated temperature
- 4.5 Pipe assembly [Go to Page]
- 4.5.1 General
- 4.5.2 Pipe ends
- 4.5.3 Diameter and wall thickness of the casing
- 4.5.4 Centre line deviation
- 4.5.5 Expected thermal life and long term temperature resistance [Go to Page]
- 4.5.5.1 General remarks
- 4.5.5.2 Shear strength
- 4.5.6 Thermal conductivity in unaged condition
- 4.5.7 Thermal conductivity at artificially aged condition
- 4.5.8 Impact resistance
- 4.5.9 Long term creep resistance and modulus
- 4.5.10 Surface conditions at delivery
- 4.5.11 Measuring wires for surveillance systems
- 5 Test methods [Go to Page]
- 5.1 General conditions and test specimens [Go to Page]
- 5.1.1 General conditions
- 5.1.2 Test specimens
- 5.2 Casing [Go to Page]
- 5.2.1 Appearance and surface finish
- 5.2.2 Elongation at break
- 5.2.3 Carbon black dispersion, homogeneity
- 5.2.4 Stress crack resistance test
- 5.3 Polyurethane rigid foam insulation (PUR) [Go to Page]
- 5.3.1 Composition
- 5.3.2 Cell structure
- 5.3.3 Compressive strength
- 5.3.4 Foam density
- 5.3.5 Water absorption
- 5.4 Pipe assembly [Go to Page]
- 5.4.1 Axial shear strength [Go to Page]
- 5.4.1.1 Test specimen
- 5.4.1.2 Test procedure
- 5.4.1.3 Calculation of shear strength
- 5.4.1.4 Axial shear strength at 23 C
- 5.4.1.5 Axial shear strength at 140 C
- 5.4.2 Tangential shear strength [Go to Page]
- 5.4.2.1 Test specimen
- 5.4.2.2 Test procedure
- 5.4.2.3 Calculation of shear strength
- 5.4.3 Shear strength of the pipe assembly after ageing [Go to Page]
- 5.4.3.1 Pipe specimen and ageing
- 5.4.3.2 Test procedure
- 5.4.4 Thermal conductivity in unaged condition
- 5.4.5 Thermal conductivity at artificially aged condition
- 5.4.6 Impact resistance
- 5.4.7 Long term creep resistance and modulus at 140 C
- 6 Marking [Go to Page]
- 6.1 General
- 6.2 Steel service pipe
- 6.3 Casing
- 6.4 Pipe assembly
- Annex A (informative) Relation between actual continuous operating conditions and accelerated ageing test conditions
- Annex B (informative) Calculation of the minimum expected thermal life with operation at various temperatures with respect to PUR foam performance
- Annex C (normative) !Calculated Continuous Operating Temperature (CCOT)
- C.1 General
- C.2 Principle
- C.3 Symbols
- C.4 Ageing and shear strength determinations
- C.5 Calculations
- C.5.1 Determination of the thermal life at different ageing temperatures
- C.5.2 Adoption to the Arrhenius relation
- C.5.3 Calculated continuous operating temperature, CCOT
- Annex D (informative) Guidelines for inspection and testing
- D.1 General
- D.2 Manufacturer's type test
- D.3 Manufacturer’s quality control
- D.4 External inspection
- D.5 Manufacturer's responsibility
- Annex E (informative) Radial creep behaviour of the polyurethane foam (PUR)
- Annex F (normative) Thermal conductivity of pre-insulated pipes - Test procedure
- F.1 Scope
- F.2 Requirements (EN ISO 8497:1996, Clause 5)
- F.2.1 Test specimen (EN ISO 8497:1996, 5.1)
- F.2.2 Operating temperature (EN ISO 8497:1996, 5.2)
- F.2.3 Types of apparatus (EN ISO 8497:1996, 5.5)
- F.3 Apparatus (EN ISO 8497:1996, Clause 7)
- F.3.1 Guarded end apparatus
- F.3.2 Calibrated end apparatus
- F.3.3 Dimensions (EN ISO 8497:1996, 7.2)
- F.3.4 Heater pipe surface temperature
- F.4 Test specimens (EN ISO 8497:1996, Clause 8)
- F.4.1 Conditioning (EN ISO 8497:1996, 8.4)
- F.4.2 Dimension measurement (EN ISO 8497:1996, 8.5)
- F.4.3 Surface temperature measurement
- F.4.4 Location of temperature sensors (EN ISO 8497:1996, 8.6)
- F.5 Procedure (EN ISO 8497:1996, Clause 9)
- F.5.1 Test length (EN ISO 8497:1996, 9.1.1)
- F.5.2 Diameter (EN ISO 8497:1996, 8.5)
- F.5.3 Thickness of casing
- F.5.4 Ambient requirements (EN ISO 8497:1996, 9.2)
- F.5.5 Test pipe temperature (EN ISO 8497:1996, 9.3)
- F.5.6 Power supply (EN ISO 8497:1996, 7.9)
- F.5.7 Axial heat loss$
- F.5.8 Test period and stability (EN ISO 8497:1996, 9.5.3)
- F.6 Calculations (EN ISO 8497:1996, Clause 11)
- F.6.1 Thermal conductivity (EN ISO 8497:1996, 3.5)
- F.7 Symbols and units (EN ISO 8497:1996 Clause 4)
- Annex G (informative) National A-deviations
- G.1 Swedish national legislative deviations on steel service pipes
- Annex H (informative) Main changes from the previous edition of EN 253
- Annex I (informative) Waste treatment and recycling
- Bibliography
- en cover page.pdf [Go to Page]
- Contents Page
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Requirements [Go to Page]
- 4.1 General
- 4.2 Steel service pipe [Go to Page]
- 4.2.1 Specification
- 4.2.2 Diameter
- 4.2.3 Wall thickness
- 4.2.4 Surface condition
- 4.3 Casing [Go to Page]
- 4.3.1 Material properties [Go to Page]
- 4.3.1.1 Material composition
- 4.3.1.2 Melt mass-flow rate
- 4.3.1.3 Thermal stability
- 4.3.1.4 Use of rework material
- 4.3.2 Casing properties [Go to Page]
- 4.3.2.1 Nominal outside diameter
- 4.3.2.2 Wall thickness
- 4.3.2.3 Appearance, surface finish, pipe ends
- 4.3.2.4 Elongation at break
- 4.3.2.5 Heat reversion
- 4.3.2.6 Stress crack resistance
- 4.4 Polyurethane rigid foam insulation (PUR) [Go to Page]
- 4.4.1 Composition
- 4.4.2 Cell structure
- 4.4.3 Compressive strength
- 4.4.4 Foam density
- 4.4.5 Water absorption at elevated temperature
- 4.5 Pipe assembly [Go to Page]
- 4.5.1 General
- 4.5.2 Pipe ends
- 4.5.3 Diameter and wall thickness of the casing
- 4.5.4 Centre line deviation
- 4.5.5 Expected thermal life and long term temperature resistance [Go to Page]
- 4.5.5.1 General remarks
- 4.5.5.2 Shear strength
- 4.5.6 Thermal conductivity in unaged condition
- 4.5.7 Thermal conductivity at artificially aged condition
- 4.5.8 Impact resistance
- 4.5.9 Long term creep resistance and modulus
- 4.5.10 Surface conditions at delivery
- 4.5.11 Measuring wires for surveillance systems
- 5 Test methods [Go to Page]
- 5.1 General conditions and test specimens [Go to Page]
- 5.1.1 General conditions
- 5.1.2 Test specimens
- 5.2 Casing [Go to Page]
- 5.2.1 Appearance and surface finish
- 5.2.2 Elongation at break
- 5.2.3 Carbon black dispersion, homogeneity
- 5.2.4 Stress crack resistance test
- 5.3 Polyurethane rigid foam insulation (PUR) [Go to Page]
- 5.3.1 Composition
- 5.3.2 Cell structure
- 5.3.3 Compressive strength
- 5.3.4 Foam density
- 5.3.5 Water absorption
- 5.4 Pipe assembly [Go to Page]
- 5.4.1 Axial shear strength [Go to Page]
- 5.4.1.1 Test specimen
- 5.4.1.2 Test procedure
- 5.4.1.3 Calculation of shear strength
- 5.4.1.4 Axial shear strength at 23 C
- 5.4.1.5 Axial shear strength at 140 C
- 5.4.2 Tangential shear strength [Go to Page]
- 5.4.2.1 Test specimen
- 5.4.2.2 Test procedure
- 5.4.2.3 Calculation of shear strength
- 5.4.3 Shear strength of the pipe assembly after ageing [Go to Page]
- 5.4.3.1 Pipe specimen and ageing
- 5.4.3.2 Test procedure
- 5.4.4 Thermal conductivity in unaged condition
- 5.4.5 Thermal conductivity at artificially aged condition
- 5.4.6 Impact resistance
- 5.4.7 Long term creep resistance and modulus at 140 C
- 6 Marking [Go to Page]
- 6.1 General
- 6.2 Steel service pipe
- 6.3 Casing
- 6.4 Pipe assembly
- Annex A (informative) Relation between actual continuous operating conditions and accelerated ageing test conditions
- Annex B (informative) Calculation of the minimum expected thermal life with operation at various temperatures with respect to PUR foam performance
- Annex C (normative) !Calculated Continuous Operating Temperature (CCOT)
- C.1 General
- C.2 Principle
- C.3 Symbols
- C.4 Ageing and shear strength determinations
- C.5 Calculations
- C.5.1 Determination of the thermal life at different ageing temperatures
- C.5.2 Adoption to the Arrhenius relation
- C.5.3 Calculated continuous operating temperature, CCOT
- Annex D (informative) Guidelines for inspection and testing
- D.1 General
- D.2 Manufacturer's type test
- D.3 Manufacturer’s quality control
- D.4 External inspection
- D.5 Manufacturer's responsibility
- Annex E (informative) Radial creep behaviour of the polyurethane foam (PUR)
- Annex F (normative) Thermal conductivity of pre-insulated pipes - Test procedure
- F.1 Scope
- F.2 Requirements (EN ISO 8497:1996, Clause 5)
- F.2.1 Test specimen (EN ISO 8497:1996, 5.1)
- F.2.2 Operating temperature (EN ISO 8497:1996, 5.2)
- F.2.3 Types of apparatus (EN ISO 8497:1996, 5.5)
- F.3 Apparatus (EN ISO 8497:1996, Clause 7)
- F.3.1 Guarded end apparatus
- F.3.2 Calibrated end apparatus
- F.3.3 Dimensions (EN ISO 8497:1996, 7.2)
- F.3.4 Heater pipe surface temperature
- F.4 Test specimens (EN ISO 8497:1996, Clause 8)
- F.4.1 Conditioning (EN ISO 8497:1996, 8.4)
- F.4.2 Dimension measurement (EN ISO 8497:1996, 8.5)
- F.4.3 Surface temperature measurement
- F.4.4 Location of temperature sensors (EN ISO 8497:1996, 8.6)
- F.5 Procedure (EN ISO 8497:1996, Clause 9)
- F.5.1 Test length (EN ISO 8497:1996, 9.1.1)
- F.5.2 Diameter (EN ISO 8497:1996, 8.5)
- F.5.3 Thickness of casing
- F.5.4 Ambient requirements (EN ISO 8497:1996, 9.2)
- F.5.5 Test pipe temperature (EN ISO 8497:1996, 9.3)
- F.5.6 Power supply (EN ISO 8497:1996, 7.9)
- F.5.7 Axial heat loss$
- F.5.8 Test period and stability (EN ISO 8497:1996, 9.5.3)
- F.6 Calculations (EN ISO 8497:1996, Clause 11)
- F.6.1 Thermal conductivity (EN ISO 8497:1996, 3.5)
- F.7 Symbols and units (EN ISO 8497:1996 Clause 4)
- Annex G (informative) National A-deviations
- G.1 Swedish national legislative deviations on steel service pipes
- Annex H (informative) Main changes from the previous edition of EN 253
- Annex I (informative) Waste treatment and recycling
- Bibliography [Go to Page]
